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A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of$3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard deviation of $2.14. The means appear very close, but not the variances.
At a=.05, is there a difference in variances?
Perform 5 steps hypothesis testing for: 9.22, 9.62, 9.66, &9.68
The sample standard deviation of the first set of strengths was 8.2 ksi, the second set's S value was 9.8 ksi, and the S value for the 25 differences in strengths was 3.3 ksi.
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked" large" and shrimp that weigh less than 0.47 ounces each into packages marked "small"; the remainder are packed in "medium" size packages.
Smith Software Inc. is a computer software firm that has grown in size in recent years. To assist in its planning for future growth, you are to determine the trend of the number of accounts based upon the below.
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
Test whether the average cycle of sleeping and waking differs significantly from 24 hours.
Compute the Pearson correlation. Multiply each X value by 2 and compute the Pearson correlation for the modified scores.
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of significance, test to see if the proportion of voters has changed. Calculate the value of the Chi-Square Test Statistic for this problem. What is it?
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
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